Oral appliances are small plastic devices, much like a mouth guard, that fit in the mouth duringsleep. They are used to treat snoring and mild to moderate obstructive sleep apnea. While typically notas effective as CPAP therapy, oral appliances can be used as a sole method of treatment for people whocannot tolerate CPAP therapy. They can also be used as a travel treatment option to compliment at-home CPAP use because they are easier to transport. Oral appliances work by repositioning andstabilizing the lower jaw or tongue in a forward position to prevent the soft tissue at the back of thethroat from collapsing. This keeps the airway open and encourages sufficient air intake.